Re: NSDocument -canAsynchronouslyWriteToURL::: never called
Re: NSDocument -canAsynchronouslyWriteToURL::: never called
- Subject: Re: NSDocument -canAsynchronouslyWriteToURL::: never called
- From: Alex Zavatone <email@hidden>
- Date: Sun, 10 Jun 2012 15:21:41 -0400
On Jun 10, 2012, at 1:45 PM, Markus Spoettl wrote:
> DeprecatedOn 6/10/12 7:21 PM, Markus Spoettl wrote:
>> Keeping the list server busy while everyone else seem to have better things to
>> do...
>>
>> Is there an magic trick to get the framework to actually call NSDocument's
>>
>> - (BOOL)canAsynchronouslyWriteToURL:(NSURL *)url ofType:(NSString *)typeName
>> forSaveOperation:(NSSaveOperationType)saveOperation
>>
>> I'd like to do as the documentation suggests and put the document writing into a
>> background tread (if you follow the little flood of NSDocument related messages
>> you know why). Documentation says:
>>
>> --------
>> The default implementation of this method returns NO. You are strongly
>> encouraged to override it and make it return YES, after making sure your
>> overrides of document writing methods can be safely invoked on a non-main
>> thread, and making sure that unblockUserInteraction is invoked at some
>> appropriate time during writing.
>> --------
>>
>> There's no precondition listed, but there seems to be one as my override is
>> never called. Why?
>
> Well, it suddenly started working and the reason is that apparently you need to have
>
> -saveToURL:ofType:forSaveOperation:completionHandler:
>
> overwritten. If you don't you just don't get to use background writing. Overwriting this method does the trick. One would think that the existence of
This is one of the "joys" of Mac development I've seen. Class methods are called that you never know about and you have to override stuff that you never knew were parts of the class, let alone are even called.
Glad you got everything working.
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